Let’s say you want to begin collecting historical data about the network traffic flowing across your 
network. Perhaps you want to create charts and graphs of network utilization over time, maybe you want to charge back departments that are using the most network traffic, or maybe you just want to monitor link utilization over time.
If any of these network accounting scenarios sound appealing, you should familiarize yourself with Cisco’s NetFlow technology. Let’s take a closer look. Cisco administration 101: Monitor network traffic with NetFlow
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